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[German Version] I. Philosophy and Religious Studies – II. Christianity – III. Practical Theology – IV. Church Law – V. Judaism – VI. Islam I. Philosophy and Religious Studies The word “heresy” derives from Gk αἵρεσις/ haíresis (“act of choice,” “decision”). In the Hellenistic period, when a plurality of philosophical schools had developed, the word was used to express the need of budding philosophers to choose between these schools. Hence it came to be used to denote both a philosophical school and the school's teaching; in…